CN108599276B - Hybrid energy storage power distribution method considering secondary distribution - Google Patents

Hybrid energy storage power distribution method considering secondary distribution Download PDF

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CN108599276B
CN108599276B CN201810309350.4A CN201810309350A CN108599276B CN 108599276 B CN108599276 B CN 108599276B CN 201810309350 A CN201810309350 A CN 201810309350A CN 108599276 B CN108599276 B CN 108599276B
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CN108599276A (en
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彭嘉俊
杨苹
曾智基
陈燿圣
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South China University of Technology SCUT
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48Controlling the sharing of the in-phase component
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

Abstract

The invention provides a hybrid energy storage power distribution method considering secondary distribution. After the system decides the current total power instruction value of the hybrid energy storage, the initial power instructions of the power type energy storage and the energy type energy storage are calculated based on the high-pass filter and the charge-discharge constraint of each energy storage, and then the final power instruction values of the power type energy storage and the energy type energy storage are determined by using a hybrid energy storage secondary distribution algorithm. The method provided by the invention is simple and practical, and through simulation verification, the method is effectively adapted to the dispatching instruction of the microgrid central controller, can effectively combine the respective advantages of the hybrid energy storage, has higher instruction completion rate than the traditional high-pass filtering hybrid energy storage distribution method, ensures the rationality of power distribution, and greatly improves the service life of the energy type energy storage in the hybrid energy storage system.

Description

Hybrid energy storage power distribution method considering secondary distribution
Technical Field
The invention belongs to the field of hybrid energy storage control, and particularly relates to a hybrid energy storage power distribution method considering secondary distribution.
Background
With the further improvement of the permeability of the distributed new energy in the microgrid, as any one energy storage technology still cannot take into account various factors such as high power density, high energy density, long service life, safety and the like, the requirement of a system on power under multiple time scales cannot be met by only configuring a single energy storage body in the microgrid. A Hybrid Energy Storage System (HESS) combining power type Energy Storage and Energy type Energy Storage can exert the advantages of different Energy Storage bodies, improve the overall performance of the System through characteristic complementation and reduce the construction investment cost and the operation cost of the Energy Storage System.
The literature search of the prior art shows that a hybrid energy storage system control strategy design (Lijian, Xiexiao, Zhangong, Wanke, Zhoudan, Zhao wave) based on the charge-discharge state of a lithium battery provides a hybrid energy storage allocation method adopting various measures including energy allocation, state coordination, limit protection coordination control and the like in a hybrid energy storage system control strategy design [ J ] based on the charge-discharge state of the lithium battery, 2013,37(01):70-75 ]. In order to improve the overall regulation capacity of hybrid energy storage, the adjustable capacity of the hybrid energy storage part is sacrificed during coordination control, and the effect is possibly poor when the hybrid energy storage is applied to safety and stability emergency control of a micro-grid. A power distribution strategy (Jiangxi, Zhou, Wangxiang and Yangyangong) suitable for a micro-grid hybrid energy storage system is a power distribution strategy [ J ] suitable for the micro-grid hybrid energy storage system, a power automation device 2015,35(04):38-43+52.) provides a real-time power distribution strategy taking the charge state of a super capacitor and the total loss of hybrid energy storage as control targets. The above documents need to solve the local optimal solution of the power loss nonlinear equation by using a quadratic interpolation method when solving the super capacitor instruction value, and have a large requirement on the computing capability of the controller.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a high-pass filtering hybrid energy storage power distribution method considering secondary distribution.
A high-pass filtering hybrid energy storage power distribution method considering secondary distribution comprises the following steps of hybrid energy storage power primary distribution and secondary distribution:
(1) primary distribution of hybrid energy storage power: the hybrid energy storage power primary distribution adopts a traditional high-pass filter to decompose high-frequency components and low-frequency components of a hybrid energy storage power instruction, and then the instruction value is preliminarily determined according to respective charge and discharge power constraint conditions of power type energy storage and energy type energy storage.
(2) Secondary distribution of mixed energy storage: under a specific charge state, the primary distribution value of the hybrid energy storage power possibly cannot meet the requirement of the total power instruction value of the hybrid energy storage, so that a secondary distribution algorithm of the hybrid energy storage is introduced, the remaining adjustable capacity of the energy storage is fully utilized, the change rate of the energy storage instruction and the charge-discharge constraint are considered, and the power instruction deviation is filled as far as possible on the premise of not damaging the service life of the energy storage.
Further, the high-pass filtering hybrid energy storage power distribution method considering the secondary distribution comprises the following steps:
step 1: inputting power signal P at last moment of power type and energy type energy storagep(t- Δ t), instruction value P at previous moment of hybrid energy storagee(t- Δ t), and a hybrid energy storage total power command value
Step 2: decomposing the high-frequency component of the hybrid energy storage at the current moment as a power command value of the power type energy storage, as shown in the following formula:
in the formula, TfRepresents the high pass filter time constant in seconds; Δ t represents the calculation step, in seconds, Pp(t) represents a power command value of the power type energy storage at time t;
and step 3: calculating a power command value of the energy type stored energy at the current moment as shown in the following formula:
and 4, step 4: calculating real-time charge-discharge constraint of hybrid energy storage according to real-time charge states of power type and energy type energy storage, as shown in the following formula:
in the formula:andrespectively the maximum discharge power and the maximum charge power of the energy storage system; SOCmin2And SOCmax1Boundary values respectively representing a normal operating range of the energy storage system; SOCmin1And SOCmax2Respectively, represent an overcharge and overdischarge warning state of charge value of the energy storage system. The above parameters need to be determined according to the performance and technical characteristics of the specific energy storage system and the recommendations of manufacturers.
According to the formula, the real-time charging and discharging power range of the power type energy storage can be knownReal-time charging and discharging power range of energy type energy storage
And 5: calculating and considering the power initial instruction value after the charge and discharge constraints of the energy type and the power type energy storage, as shown in the following formula:
at this point, the primary distribution of the hybrid energy storage power is finished,the initial power instruction value at the time t after the power type energy storage charging and discharging is restrained is represented;represents the minimum value of real-time charge and discharge power of energy type energy storage,representing the maximum value of real-time charge and discharge power of energy type energy storage;
step 6: if the power type energy storage power instruction is restricted by the charge state in one distribution, calculating the power type energy storage power difference delta PpAs shown in the following formula:
wherein, Pp(t) represents a power command value of the power type energy storage at time t;
if the power type energy storage power command is not constrained by the state of charge in one allocation, step 9 is entered.
And 7: if power type energy storage power difference delta PpThe energy storage is adopted, and two conditions need to be judged, namely whether the energy storage is met or notThe energy power charging and discharging constraint requirement, and whether the energy type energy storage is ensured to avoid the risk of frequent charging and discharging. Namely, whether the following conditions are satisfied. If yes, entering the next step, and if not, entering the step 12
Wherein the content of the first and second substances,indicates the initial power command value at time t after the energy storage charge/discharge is regulated,represents the minimum value of real-time charge and discharge power of energy type energy storage,representing the maximum value of real-time charging and discharging power, P, of energy-type stored energye(t- Δ t) represents a command value at the previous moment of the hybrid energy storage;
and 8: calculating the secondary distribution instruction values of the power type and the energy type stored energy, as shown in the following formula:
and step 9: if the energy storage power command is constrained by the state of charge during a single allocation, the energy storage power difference Δ P is calculatedeAs shown in the following formula:
if the energy storage power command is not constrained by the state of charge at a time of allocation, step 12 is entered.
Step 10: judging whether the charge-discharge constraint of the power type energy storage is satisfied if the energy type energy storage power difference is borne by the power type energy storage, namely Representing the maximum value of the charge and discharge power of the power type energy storage, and entering the next step if the maximum value is met; if not, step 12 is entered.
Step 11: calculating the secondary distribution instruction values of the power type and the energy type stored energy, as shown in the following formula:
step 12: the power of the hybrid energy storage is not distributed secondarily, namely the value of the primary distribution is maintained, as shown in the following formula:
step 13: and issuing a hybrid energy storage instruction, and finishing the adjustment of the current round.
Therefore, aiming at the defects, the invention provides a hybrid energy storage power distribution method considering secondary distribution, which has less calculation amount, can be effectively applied to a control strategy of a short time scale and is easy to engineer. And when the system decides the current total power instruction value of the hybrid energy storage, calculating initial power instructions of the power type energy storage and the energy type energy storage based on the high-pass filter and the charge-discharge constraint of each energy storage, and then determining the final power instruction values of the power type energy storage and the energy type energy storage by utilizing the secondary distribution of the hybrid energy storage.
Compared with the prior art, the invention has the following effects: the method takes the defect that the residual capacity possibly existing in the hybrid energy storage is not reasonably utilized due to the traditional high-pass filtering power distribution method into consideration, improves the instruction completion rate, ensures the rationality of power distribution and greatly improves the service cycle of the hybrid energy storage system by utilizing the hybrid energy storage secondary distribution algorithm.
Drawings
Fig. 1 is a composite strategy flow diagram for multiple energy storage power allocation.
Fig. 2 is an active power command curve of the hybrid energy storage system used for the test.
Fig. 3a and 3b are deviation curves of the hybrid energy storage actual power distribution value and the command value of the hybrid energy storage actual power distribution algorithm without adding and adding the quadratic distribution algorithm in the example respectively.
Fig. 4a and 4b are the actual power distribution curve and the state of charge curve of the hybrid energy storage without and with the secondary distribution algorithm in the example respectively.
Detailed Description
The present invention will be described and verified in further detail with reference to the following examples and drawings, but the embodiments of the present invention are not limited thereto.
Referring to fig. 1, a hybrid energy storage power allocation method considering secondary allocation in this example includes the following specific steps.
Step 1: inputting power signal P at last moment of power type and energy type energy storagep(t- Δ t), instruction value P at previous moment of hybrid energy storagee(t- Δ t), and a hybrid energy storage total power command value
Step 2: decomposing the high-frequency component of the hybrid energy storage at the current moment as a power command value of the power type energy storage, as shown in the following formula:
in the formula, TfRepresents the high pass filter time constant in seconds; Δ t represents the calculation step size in seconds.
And step 3: calculating a power command value of the energy type stored energy at the current moment as shown in the following formula:
and 4, step 4: calculating real-time charge-discharge constraint of hybrid energy storage according to real-time charge states of power type and energy type energy storage, as shown in the following formula:
in the formula:andrespectively the maximum discharge power and the maximum charge power of the energy storage system; SOCmin2And SOCmax1Boundary values respectively representing a normal operating range of the energy storage system; SOCmin1And SOCmax2Respectively, represent an overcharge and overdischarge warning state of charge value of the energy storage system. The above parameters need to be determined according to the performance and technical characteristics of the specific energy storage system and the recommendations of manufacturers.
According to the formula, the real-time charging and discharging power range of the power type energy storage can be knownReal-time charging and discharging power range of energy type energy storage
And 5: calculating and considering the power initial instruction value after the charge and discharge constraints of the energy type and the power type energy storage, as shown in the following formula:
and at this moment, the primary distribution of the hybrid energy storage power is finished.
Step 6: if the power type energy storage power instruction is restricted by the charge state in one distribution, calculating the power type energy storage power difference delta PpAs shown in the following formula:
if the power type energy storage power command is not constrained by the state of charge in one allocation, step 9 is entered.
And 7: if power type energy storage power difference delta PpThe energy storage is adopted, and two conditions need to be judged, namely whether the power charge and discharge constraint requirement of the energy storage is met or not, and whether the energy storage is ensured or not to avoid the risk of frequent charge and discharge. Namely, whether the following conditions are satisfied. If it satisfiesThen go to the next step, if not, go to step 12
And 8: calculating the secondary distribution instruction values of the power type and the energy type stored energy, as shown in the following formula:
and step 9: if the energy storage power command is constrained by the state of charge during a single allocation, the energy storage power difference Δ P is calculatedeAs shown in the following formula:
if the energy storage power command is not constrained by the state of charge at a time of allocation, step 12 is entered.
Step 10: judging whether the charge-discharge constraint of the power type energy storage is satisfied if the energy type energy storage power difference is borne by the power type energy storage, namelyIf yes, entering the next step; if not, step 12 is entered.
Step 11: calculating the secondary distribution instruction values of the power type and the energy type stored energy, as shown in the following formula:
step 12: the power of the hybrid energy storage is not distributed secondarily, namely the value of the primary distribution is maintained, as shown in the following formula:
step 13: and issuing a hybrid energy storage instruction, and finishing the adjustment of the current round.
Specific technical parameters of the hybrid energy storage system used in the present example are shown in table 1.
TABLE.1 hybrid energy storage technology parameter and control parameter settings
Type of parameter Energy type energy storage system Power type energy storage system
Rated power of inverter (kW) 500 60
Energy storage body capacity (kWh) 3000 1.2
Soc operating Range 0.25~0.95 0.2~0.9
Overcharge protection Soc threshold 0.3 0.25
Over-discharge protection Soc threshold 0.8 0.8
Charge and discharge efficiency 90% 95%
Self-discharge rate (%/s) 0 0.00017
And carrying out simulation test based on Matlab, and designing two groups of tests for comparing the instruction completion effects of adding secondary distribution and not adding secondary distribution. The acquisition period of the controller is set to be 0.1s, the high-pass filtering time constant is set to be 5s, the initial value of the charge state of the energy type energy storage system is 0.8, and the initial value of the charge state of the power type energy storage system is 0.8. The active power instruction curve of the hybrid energy storage system used for the test is shown in a graph II, the deviation curve of the actual power distribution value of the hybrid energy storage system without the secondary distribution algorithm and the instruction value is shown in a graph 3a, and the deviation curve of the actual power distribution value of the hybrid energy storage system without the secondary distribution algorithm and the instruction value is shown in a graph 3 b. The actual power distribution curve and the state of charge curve of the hybrid energy storage without adding the secondary distribution algorithm are shown in fig. 4a, and the actual power distribution curve and the state of charge curve of the hybrid energy storage with adding the secondary distribution algorithm are shown in fig. 4 b. The specific description is as follows.
According to the traditional high-pass filtering hybrid energy storage power distribution algorithm without adding a secondary distribution algorithm, the actual output power of the hybrid energy storage system can meet the active power instruction requirement of the hybrid energy storage system in most of time, and the instruction completion rate is 98.04%; the hybrid energy storage power distribution algorithm added with the secondary distribution algorithm has the advantages that the instruction completion rate is increased to 99.83%, and the instruction is not completed only near the zero crossing point of the energy type energy storage power, because the energy type energy storage is discharged at the last moment and is charged at the moment, so that the long-term stable operation of the energy storage is not facilitated.
Simulation results prove that the proposed strategy can simply and effectively improve the completion rate of the hybrid energy storage power instruction, meanwhile, the risk of frequent charging and discharging of energy type energy storage is avoided, and the long-term stable operation of the system in the operation process is ensured.
The hybrid energy storage power distribution method considering secondary distribution provided by the invention is described in detail above, the principle and the implementation mode of the invention are explained by a simulation test example based on Matlab, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (1)

1. A hybrid energy storage power distribution method considering secondary distribution is characterized in that: the method comprises the following steps of primary distribution of hybrid energy storage power and secondary distribution of hybrid energy storage power:
1) primary distribution of hybrid energy storage power: the hybrid energy storage power primary distribution algorithm adopts a high-pass filter to decompose high-frequency components and low-frequency components of a hybrid energy storage power instruction, and then performs primary determination on instruction values according to respective charge and discharge power constraint conditions of power type energy storage and energy type energy storage;
2) secondary distribution of mixed energy storage: under a certain state of charge, the primary distribution value of the hybrid energy storage power possibly cannot meet the requirement of the total power instruction value of the hybrid energy storage, so that secondary distribution of the hybrid energy storage is introduced, the remaining adjustable capacity of the energy storage is fully utilized, the change rate of the energy storage instruction and the charging and discharging constraint are considered, the power instruction deviation is filled as far as possible on the premise of not damaging the service life of the energy storage, the initial instruction value obtained by primary distribution of the hybrid energy storage power is used as an input parameter and is input into the secondary distribution of the hybrid energy storage power, and the secondary distribution of the hybrid energy storage power is completed, and the method specifically:
(1) if the power type energy storage power instruction is restricted by the charge state in one distribution, calculating the power type energy storage power difference delta PpAs shown in the following formula:
ΔPp=Pp(t)-
wherein, Pp(t) represents a power command value of the power type storage battery at time t,the initial power instruction value at the time t after the power type energy storage charging and discharging is restrained is represented;
if the active power instruction of the power type energy storage is not constrained by the charge state in one-time distribution, entering the step (7);
(2) active power difference delta P if power type energy storagepThe energy storage is adopted, and two conditions need to be determined, namely whether the power charge and discharge constraint requirement of the energy storage is met or not, and whether the energy storage is ensured to avoid the risk of frequent charge and discharge or not; namely judging whether the following conditions are met; if yes, entering the next step, and if not, entering the step (7);
wherein the content of the first and second substances,indicates the initial power command value at time t after the energy storage charge/discharge is regulated,represents the minimum value of real-time charge and discharge power of energy type energy storage,representing the maximum value of real-time charging and discharging power, P, of energy-type stored energye(t- Δ t) represents a command value at the previous moment of the hybrid energy storage;
(3) calculating the secondary distribution instruction values of the power type and the energy type stored energy, which are respectively shown as the following formulas:
(4) if the energy storage power command is constrained by the state of charge during a single allocation, the energy storage power difference Δ P is calculatedeAs shown in the following formula:
if the energy type energy storage power instruction is not constrained by the charge state in the first distribution, entering the step (7);
(5) judging whether the charge-discharge constraint of the power type energy storage is satisfied if the energy type energy storage power difference is borne by the power type energy storage, namely Representing the maximum value of the charge and discharge power of the power type energy storage, and entering the next step if the maximum value is met; if not, entering a step (7);
(6) calculating the secondary distribution instruction values of the power type and the energy type stored energy, which are respectively shown as the following formulas:
(7) the power of the hybrid energy storage is not distributed secondarily, namely the value of the primary distribution is maintained, as shown in the following formula:
(8) and issuing a hybrid energy storage instruction, and finishing the adjustment of the current round.
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